Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.
Answer: C. remained
The correct answer is C. remained.
A linking verb connects the subject to a word that describes it, rather than showing an action.
"Remained" links the subject (mystery) to the adjective that describes its state (unsolved).
Mystery (A) is the subject (noun).
Unsolved (B) is the adjective describing the mystery.
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